METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

The combination meter assembly (meter circuit plate) receives vehicle speed signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU (brake booster with master cylinder assembly). The skid control ECU (brake booster with master cylinder assembly) supplies power to the vehicle speed sensor. The skid control ECU (brake booster with master cylinder assembly) detects vehicle speed signals based on pulses of the voltage.

Tech Tips

Factors that affect the indicated vehicle speed include the tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error.

WIRING DIAGRAM

B006I8LE16
*1 Skid Control ECU (Brake Booster with Master Cylinder Assembly)
*2 CAN Communication Line
*3 Combination Meter Assembly (Meter Circuit Plate)

CAUTION / NOTICE / HINT

Note


  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

  • Before starting the following inspection, inspect the speedometer and that the tire size and air pressure are as specified.

    Tire size and air pressure: Click here

    Speedometer: Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output.

      Click here

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check if electronically controlled brake system DTCs are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Speed Meter Operation Speedometer OFF, 0, 40, 80, 120 or 160

      There is a deviation in the values displayed on the speedometer (Control range → Speedometer display)


        Reference mph:

      • 40 → 42 to 44

      • 80 → 83 to 85

      • 120 → 125 to 127

      • 160 → 166 to 168


        Reference km/h:

      • 40 → 42 to 44

      • 80 → 84 to 86

      • 120 → 125 to 127

      • 160 → 167 to 169

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Speed Meter Operation
      OK
      Speedometer indication is normal.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here
    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for RHD: Click here

    NG

    REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE) Click here